Added method to get metadata out of the player.

The method passes a list of metadata ids to be retrieved and
a parcel where the metadata records should be appended.

If the list of ids is empty, all the metadata should be returned.
diff --git a/media/libmediaplayerservice/TestPlayerStub.h b/media/libmediaplayerservice/TestPlayerStub.h
index 80d53a8..339b108 100644
--- a/media/libmediaplayerservice/TestPlayerStub.h
+++ b/media/libmediaplayerservice/TestPlayerStub.h
@@ -94,6 +94,10 @@
     virtual status_t invoke(const android::Parcel& in, android::Parcel *out) {
         return mPlayer->invoke(in, out);
     }
+    virtual status_t getMetadata(const SortedVector<MetadataType>& ids,
+                                 Parcel *records) {
+        return INVALID_OPERATION;
+    }
 
 
     // @return true if the current build is 'eng' or 'test' and the